jdk8-mips64-public/hotspot: src/share/vm/oops/oop.pcgc.inline.hpp@8c95980d0b66

     1 /*

     2  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP

    26 #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP

    28 #include "utilities/macros.hpp"

    29 #if INCLUDE_ALL_GCS

    30 #include "gc_implementation/parNew/parNewGeneration.hpp"

    31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"

    32 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"

    33 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"

    34 #include "gc_implementation/parallelScavenge/psScavenge.hpp"

    35 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"

    36 #endif // INCLUDE_ALL_GCS

    38 inline void oopDesc::update_contents(ParCompactionManager* cm) {

    39   // The klass field must be updated before anything else

    40   // can be done.

    41   DEBUG_ONLY(Klass* original_klass = klass());

    43   Klass* new_klass = klass();

    44   if (!new_klass->oop_is_typeArray()) {

    45     // It might contain oops beyond the header, so take the virtual call.

    46     new_klass->oop_update_pointers(cm, this);

    47   }

    48   // Else skip it.  The TypeArrayKlass in the header never needs scavenging.

    49 }

    51 inline void oopDesc::follow_contents(ParCompactionManager* cm) {

    52   assert (PSParallelCompact::mark_bitmap()->is_marked(this),

    53     "should be marked");

    54   klass()->oop_follow_contents(cm, this);

    55 }

    57 inline oop oopDesc::forward_to_atomic(oop p) {

    58   assert(ParNewGeneration::is_legal_forward_ptr(p),

    59          "illegal forwarding pointer value.");

    60   markOop oldMark = mark();

    61   markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);

    62   markOop curMark;

    64   assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");

    65   assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");

    67   while (!oldMark->is_marked()) {

    68     curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);

    69     assert(is_forwarded(), "object should have been forwarded");

    70     if (curMark == oldMark) {

    71       return NULL;

    72     }

    73     // If the CAS was unsuccessful then curMark->is_marked()

    74     // should return true as another thread has CAS'd in another

    75     // forwarding pointer.

    76     oldMark = curMark;

    77   }

    78   return forwardee();

    79 }

    81 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP

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